Planter box



FIG. 1 is a front perspective view of a planter box showing our new design;

FIG. 2 is a frontal elevation view thereof;

FIG. 3 is a side elevation view thereof, the opposite side view being a mirror image of that shown; and,

FIG. 4 is a top plan view thereof. 

The ornamental design for a planter box, as shown and described. 